1.Biological weathering-Plants and animals release acid forming chemicals that cause weathering and also contribute to the breaking down of rocks and landforms.

2.Plants change Earth’s surface through weathering and erosion.They take minerals from the rock. This is a type of weathering, and it weakens the rock. Eventually the surface of the rock starts to break down and become soil.

3.As larger plants like trees start to grow in a rocky area, their roots

grow into the small cracks in the rock. Slowly, as the tree grows, its roots break the rock apart. This forms more soil and makes it easier for other plants to grow there as well.

4.When too many animals live in one place, they tend to eat and trample all the plants. Without the plants to protect the soil, it is more likely to be eroded by wind and water.

Helped by none other than the ONE & Only #QUEEN herself aka #DRIPPQUEENMO

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2 years ago

An increase in temperature affects the reaction rate by decreasing the velocities of particles that collide in the reaction. inc

soldier1979 [14.2K]

Answer:

increasing the number of molecules that have sufficient kinetic energy to react.

7 0

2 years ago

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In the laboratory, a genetics student crossed flies with normal, long wings to flies with mutant, dumpy wings, which she believe

Marianna [84]

Answer:

a. Chi-Square Value = 0.12

b. Degrees of freedom = 1

c. Reject or fail to reject the hypothesis = fail to reject the hypothesis

Explanation:

Available data:

Cross: long wings to flies with mutant, dumpy wings
F1) 100% long-winged flies
F2) 672 long-winged flies 218 dumpy-winged flies
Hypothesis: the dumpy wing is inherited as a recessive trait

Let us name the allele for Long L and the allele for dumpy l

The number of observed individuals:

Total number: 890 flies (672 + 218)
Long-winged = 672
Dump-winged = 218

In the F2 generation, if l was a recessive allele and L a dominant allele, exhibiting complete dominance, we would expect a 3:1 phenotypic ratio.

Cross: Ll x Ll

Gametes) L l L l

Punnett square) L l

L LL Ll

l lL ll

F2) 3/4 LL + Ll long-winged individuals

1/4 ll dump-winged individuals

From this ratio and the total number of individuals in the F2 generation, we can get the expected number of individuals:

4 possible genotypes ------- 890 individuals

3 LL + Ll genotype ------------X = 667.5 long-winged individuals

1 ll genotype ---------------------X = 222.5 dump-winged individuals

Chi square = ∑ (O-E)²/E

LL + Ll = (O-E)² /E

LL+ Ll = (672 - 667.5) ² / 667.5

LL + Ll = 0.03

ll= (O-E)²/E

ll= (218 - 222.5)² / 222.5

ll= 0.09

Chi square= ∑ ((O-E)²/E) = 0.03 + 0.09 = 0.12
Freedom Degrees = genotypes - alleles = 3 - 2 = 1
Significance level = 0.05

Table value/Critical value = 3.84

0.12 < 3.84 meaning that there is enough evidence to reject the null hypothesis.

Fail to reject the hypothesis. The genotypes in the population might be in equilibrium H-W. L is the dominant allele, and l is the recessive allele. The dumpy wing is inherited as a recessive trait.

6 0

2 years ago